等离子体在强激光场作用下形成的电磁不稳定和自生磁场

Electromagnetic Instability and Self-Generated Magnetic Field on Plasma Formation in High Laser Field

利用理论分析和数值模拟方法,对超短超强激光脉冲与高密度等离子体相互作用中电磁不稳定和自生磁场空间分布的时间演化过程进行了研究。数值模拟结果表明:在线性超强激光的作用下,强激光照射等离子体薄靶时电子做无规则热运动,但由于等离子体临界面上激发的电磁不稳定性,电磁不稳定性随时间的增强和激光功率的逐渐深入到等离子体内部会导致强电流的形成,其结果使等离子体表面处产生自生磁场。对这些过程的细致研究对电磁不稳定性和自生磁场等过程有重要意义。

By using the theoretical analysis and numerical simulation,the time evolution relation of the spatial distribution of electromagnetic instability and Self-generated magnetic fields were investigated that generated during the interaction of ultraintense laser pulses with over-dense plasmas.The numerical simulation indicates that when the laser pulse is incident with ppolarization the initial non-Maxwell distributed plasma stimulates the electromagnetic instability in the plasma,because of the random motion of electron.Electromagnetic instability increases with the increase of time and laser power lead to produce electric current.This result generated self-generated magnetic field on the surface plasma.